ampere

Also known as amp, A, amperage, amperes, amps

The ampere ( , ; symbol: A), often shortened to amp, is the unit of electric current in the International System of Units (SI). One ampere is equal to 1 coulomb (C) moving past a point per second. It is named after French mathematician and physicist André-Marie Ampère (1775–1836), considered the father of electromagnetism along with Danish physicist Hans Christian Ørsted.

AI overview

An ampere (or amp) is the standard unit used to measure the amount of electric current flowing through something, defined as one coulomb of charge passing a point every second. It matters because it's the internationally agreed-upon way to quantify electrical flow, making it essential for understanding and working with electricity in everyday applications from household devices to industrial systems.

AI-generated from the Wikipedia summary — may contain errors.

Key facts

Unit.name: ampere
Unit.image: File:Amperemeter hg.jpg
Unit.caption: Demonstration model of a moving iron ammeter. As the current through the coil increases, the plunger is drawn further into the coil and the pointer deflects to the right.
Unit.standard: SI
Unit.quantity: electric current
Unit.symbol: A
Unit.dimension: I
Unit.namedafter: André-Marie Ampère

via Wikipedia infobox

Wikidata facts

Image: Ampere-o-meter-vintage-HDR-0h.jpg

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Wikidata SPARQL query equivalent: wd:Q25272 p:P2370/psn:P2370 [wikibase:quantityAmount ?source; wikibase:quantityUnit ?base]. ?item p:P2370/psn:P2370 [wikibase:quantityAmount ?target; wikibase:quantityUnit ?base]. BIND(?source / ?target as ?value)
conversion to SI unit: 1
unit symbol: A
Commons category: Ampere (unit)
NCI Thesaurus ID: C42536

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Article

8 sections

Contents

History
Former definition in the SI
Present definition
Units derived from the ampere
SI prefixes
See also
References
External links

As of the 2019 revision of the SI, the ampere is defined by fixing the elementary charge to be exactly , which means an ampere is an electric current equivalent to elementary charges moving every seconds, or approximately elementary charges moving in a second. Prior to the redefinition, the ampere was defined as the current passing through two parallel wires 1 metre apart that produces a magnetic force of newtons per metre.